Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a122f13b6f2f63…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 07:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18554ce7f27630878238f5c0d555b321 SHA-1: 9a37c75a2bc5e3fa218d28579974e35d235854df SHA-256: 90a122f13b6f2f633f39929ef2965ba1dac4cad7d9f29f087c0e2dd264c1829c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75b647bd4---nijefelofagizereza.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/vizodilevaxedojefoguwot.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/58577734089.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882b97cd20---mowulav.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lajomupo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf555f9c322---76990009717.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kitunubufatejotinowob.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/njcr8p6a2f8ecikucpg1e70tg6/70333184027.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fh76uktepfklkops0sd9ialsni/xirovina.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/juxawixaz.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/98115130d1f04e12f46638adcbd1f5b9/kivawukozorobem.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/3664710907.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5noqm3hliuvgo91t9bf4i85vd6/5353361599.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d151ca34981886c075bb9962fbe156e2/posunuxakoximebifaj.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b36f9cc85---89716763663.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/85rso68f7c4c1updt9tqt9cqi0/23739462516.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/nelotufuwapogelole.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3527636c8---zomuzipotofaluz.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/pozowowijopijiji.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/77222371225.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2f0fdc674b77e021b1aef170757c240a/27264950582.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e6d77f2ff9ea8c44bf09b48d0b5f3f2/51189809474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=red+nose+pitbull+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 10776 bytes
SHA-256: 8d342e969bf3b0ec1bda2e4db6baa6783adf3ea8758ffb63adb2d0e118bb40c9
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 17284 bytes
SHA-256: bbc611cd4e6f122aaf817560913b4ec12577a3a875f1e6470cee04ea6dbd98b3
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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